Pressure reduction dewatering auxiliary trenching construction process
A technology of trough-forming construction and construction technology, which is applied in basic structure engineering, excavation, construction, etc., can solve the problem of difficult to accurately control the troughing of underground diaphragm walls, achieve significant social and economic benefits, save costs, and reduce resources. cost effect
Active Publication Date: 2013-08-21
上海市地矿工程勘察(集团)有限公司
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Problems solved by technology
The device is a hydraulic trough forming device for underground diaphragm walls, and it is difficult to accurately control the trough formation of underground diaphragm walls
Method used
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[0012] Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: present embodiment implements under the premise of technical method of the present invention, has provided detailed embodiment and concrete operation process, but protection scope of the present invention is not limited to following the embodiment.
[0013] Embodiments Take a trench forming project of a certain foundation pit as an example.
[0014] The natural ground of a foundation pit engineering site is flat, and the enclosure structure of the foundation pit adopts an 800mm thick underground diaphragm wall, and the key layers are ③ 1 There are layers of silt and silt interbedded with silty clay. The thickness of the aquifer is 8-11m, the buried depth of the top of the layer is about 10.7m, and the buried depth of the bottom is about 21.3m. According to the construction of the underground diaphragm wall and the proposed grooved well, the impact of the depre...
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The invention relates to a pressure reduction dewatering auxiliary trenching construction process, which belongs to the technical field of underground project construction and comprises the following steps: (1) the pressure reduction dewatering auxiliary trenching target soil layer, the target drawdown, the trenching well position and the trenching well depth are determined according to the thickness of soil layer distribution, the excavation depth, the structural position, the environmental factor, the construction process and other factors on the basis of actual on-site engineering geological conditions; (2) the running of a dewatering system comprises opening 2 to 3 corresponding pressure reduction dewatering wells within 24 to 36 hours before trenching, carrying out pressure reductiondewatering continuously during the trenching process and stopping the pressure reduction dewatering until the pouring and the tramping of concrete in the trench section are finished, and after the concrete is poured and tramped, the pressure reduction dewatering well which is far away from the trenching is stopped, and the pressure reduction dewatering auxiliary construction is carried out in theorder; and (3) a detailed running program is worked out according to a trenching schedule so that the stability of a trench wall can be greatly improved, a reinforcement cage is hoisted and installedand the concrete is poured and tramped conveniently, and meanwhile the environmental protection requirement of surrounding areas can be satisfied.
Description
technical field [0001] The invention relates to a set of methods in the technical field of underground engineering construction, in particular to a construction technique for trough formation assisted by decompression and dewatering. Background technique [0002] The 21st century is the century of underground space development. With the development of cities, higher and higher urban buildings, deeper underground works, and increasingly complex foundation pit construction, the requirements for environmental protection during construction are getting higher and higher. The construction quality of the underground diaphragm wall of the foundation pit is very important, and the prerequisite effect of the stability of the trench wall is particularly prominent. Once the tank wall collapses and the concrete filling coefficient increases, adverse phenomena such as "big belly", mud in joints, excavation leakage, etc. are prone to occur, and even "buried machine" and mechanical overtur...
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IPC IPC(8): E02D19/10E02D17/13
Inventor 朱成兵奚磊宋顺龙王荣彪李晓海徐静文谭满生张卫国张冬冬吉利军孙瑞瑞曹岩陶思海
Owner 上海市地矿工程勘察(集团)有限公司